Chisel-gage.



Patented July as, mm. c. FRANK.

CHISEL GAGE.

[Annlication filed Oct. 19, 1900.) (N o M o d 9!.)

NTTFD Smarts aarnnr @rrrcn,

CRIST FRANK, OF PHILADELPHIA, PENNSYLVANIA.

CHISEL-=GAG E.

SPECIFICATION forming part of Letters Patent No. 678,776, dated July 16, 1901.

Application filed October 19, 1900. Serial No. 33,603. (No model.)

- To all whom it may concern.-

Be it known that I, ORIST FRANK, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a new and useful Chisel-Gage, of which the following is a specification.

My invention relates to chisel-gages, and has for its object to produce a gage which can be applied to any ordinary chisel for the purpose of regulating or adjusting the depth to which the point or edge of the chisel may be applied to a window-frame for the purpose of cutting a mortise for thereception of a hinge or a lock, &c.

IVith this object in view my invention consists in the improved construction and novel arrangement of parts of a gage, as will be hereinafter more fully set forth.

In the accompanying drawings, in which the same referencemumerals indicate corresponding parts in each of the views in which they occur, Figure 1 is a perspective view of my attachment applied to a chisel in position for use. Fig. 2 is a transverse sectional view of the attachment, the chisel being shown in side elevation; and Figs. 3 and at are perspective detail views of the parts of the at tachment.

My attachment comprises a base 1, which may be formed from any suitable material, as cast metal, and has its rear edge provided with a loop 2, beneath which a clamp 3 is adapted to be secured. The forward edge of the base is provided with a buffer i, of yielding material, as leather, which is preferably secured thereto by means of a tongue 5, which fits in a corresponding groove 6 in the forward edge of the base. The ends of the base are preferably inclined toward the rear, so that the space between the legs at the ends of the loop will be far enough apart for the insertion of a chisel of the desired width. A clamping-screw 7 is passed down through the top of the loop to engage with the top of the clamping-plate and hold it rigidly in posi tion, and the plate is provided with adjusting-screws 8 upon opposite sides of the loop for engaging with the chisel 9 to hold the attachment in position. I prefer to arrange two screws in front of the loop to elevate the front end of the plate, which is preferably made in the form of a fork 10, so that a deeper out may be made when it is desired to place the hinge all the way in the wood, while a single screw is placed in the rear of the loop, so that a cut may be made of less depth, whereby half of the hinge may be seated in the wood and half in the part to be secured thereto, as the lid of a desk. The screws in front of the loop can be made to engage therewith, so as to keep the legs of the fork from moving in either direction. The legs of the loop 2 preferably diverge away from each other, so as to engage with the edge of the wood beyond the edges of the chisel, whereby the workman is enabled at all times to see that the chisel is properly located for making the desired out.

In using my improved gage it is slipped over the forward end of a chisel and the screws in the clamp are adjusted so that the point of the chisel will strike the wood at the proper distance below the upper edge of the wood upon which the fork is supported. The set-screw through the loop is then tightened, which will draw the parts firmly together, the point of the chisel being projected forward of the front edge of the base a sufficient distance to permit of its going to the bottom of the out before the edge of the base engages with the side of the wood being operated upon and stops the forward movement of the chisel. When properly adjusted, all the workman must do to cut the proper seat for the hinge or look is to out the wood at the ends and at the side of the mortise to form the walls of the same, which can be done with the ordinary chisel. Then by placing the forks of the attachment upon the top of the wood the point of the chisel can be driven in as far as it will go, which will complete the mortise. In this manner the mortises can be formed very rapidly and each and every one of them will be the same and exactly correct for the reception of the article that is to be secured therein.

After the mortises have been out the at tachment can be readily removed from the chisel by simply loosening the set-screw in the loop. The adj usting-screws in the plate are preferably of such length that they cannot be drawn through the loop, which will thereby prevent the separation and loss of any of the parts of the device. If desired, the gage can be constructed wide enough to adapt it for use with the Widest chisel-say three inchesor it can be made in different sizes, although the narrower chisels can be secured in the wider age as readily as can be the Wider ones, thereby avoiding the absolute necessity of making the device in different sizes.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. An attachment for chisels comprising a base, the forward end of which is provided with a yielding abutment and the rear end is provided with a loop and a set-screw, a plate adapted to be positioned in said loop, the forward end of which is provided with legs and the rear end is provided with set-screws upon opposite sides of the loop, substantially as described.

2. An attachment for chisels comprising a base, the forward end of which is grooved transversely and the rear end is expanded laterally and provided witha loop, a flanged bufier-plat'e secured in the groove at the forward end of the base, a set-screw through the loop, and a clamping-plate between the'loop and the base, provided with two set-screws in front of the base and one to the rear thereof, the forward end of said plate being provided with two diverging legs, substantially as described.

3. An attachment for chisels comprising a base, the front of which is provided with a buffer and the rear with a raised loop, a screw through the loop, a clampingplate through the loop the forward portion of which is adapted to extend in front of the chiselpoint, and adj usting-screws through the plate upon opposite sides of the loop, said adjusting-screws being of a greater length than the height of the loop whereby the plate is prevented from escaping from the loop, substantially as described.

ORIST FRANK.

Witnesses:

LoUIs A. DROFFNER, FLORIAN E. MUNICH. 

